@mixin border-1px($color){
    position: relative;
    &:after{
        z-index: 2;
        position: absolute;
        content: "";
        left: 0;
        bottom: 0;
        width: 100%;
        border-bottom: 1px solid $color;
    } 
}
@mixin border-none(){
    &:after{
        display: none;
    }
}

@mixin bg-image($url){
    background-image: url($url+"@2x.png");
    @media (-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3){
        background-image: url($url+"@3x.png");
    }
}